Using a Fourier transform spectrometer, we have recorded the spectra of ozone in the region of 4600 cm 01 , with a resolution of 0.008 cm 01 . The strongest absorption in this region is due to the n 1 / n 2 / 3n 3 band which is in Coriolis interaction with the n 2 / 4n 3 band. We have been able to assign more than 1700 transitions for these two bands. To correctly reproduce the calculation of energy levels, it has been necessary to introduce the (320) state which strongly perturbs the ( 113) and ( 014) states through Coriolis-and Fermi-type resonances. Seventy transitions of the 3n 1 / 2n 2 band have also been observed. The final fit on 926 energy levels with J max Å 50 and K max Å 16 gives rms Å 3.1 1 10 03 cm 01 and provides a satisfactory agreement of calculated and observed upper levels for most of the transitions. The following values for band centers are derived: n 0 (n 1 / n 2 / 3n 3 ) Å 4658.950 cm 01 , n 0 (3n 1 / 2n 2 ) Å 4643.821 cm 01 , and n 0 (n 2 / 4n 3 ) Å 4632.888 cm 01 . Line intensities have been measured and fitted, leading to the determination of transition moment parameters for the two bands n 1 / n 2 / 3n 3 and n 2 / 4n 3 . Using these parameters we have obtained the following estimations for the integrated band intensities, S V (n 1 / n 2 / 3n 3 ) Å 8.84 1 10 022 , S V (n 2 / 4n 3 ) Å 1.70 1 10 022 , and S V (3n 1 / 2n 2 ) Å 0.49 1 10 022 cm 01 /molecule cm 02 at 296 K, which correspond to a cutoff of 10 026 cm 01 /molecule cm 02 .